With a deadly and deepening pedestrian safety problem, struggling transit and taxi systems and a boom in bike riding, San Francisco faces an abundance of transportation challenges.

Municipal Transportation Agency directors delved into the morass Tuesday at a special daylong workshop to identify the city's pressing transportation needs and set a plan for attacking the problems.

Most of the day focused on pedestrian safety issues, plans to accommodate and encourage more bicyclists and how to improve Muni service, particularly on its busy and beleaguered Metro light-rail lines.

Among the city's top priorities:

-- Increasing Muni service by 10 percent over two years.

-- Replacing Muni's fleet of light-rail cars.

-- Making pedestrian safety improvements at 24 intersections in the next two years

-- Painting transit-only lanes on Market Street red.

-- Implementing a "don't block the box" enforcement program at Market Street intersections and ticketing those who sit in the intersection during red lights.

-- Increasing the number of bicycle lanes and parking spaces.

-- Providing electronic data for taxis that would make it easier to develop apps to hail cabs.

Making those improvements will, of course, cost money and require the MTA board to set priorities and make difficult decisions about how cars, bikes, transit, parking and pedestrians share the existing infrastructure.

Ed Reiskin, the agency's transportation director, said that while finding money to improve the system is always difficult, convincing the public that major changes are needed is the bigger challenge.

"This board has the authority to make the changes, and in some cases, has the funding," he said. "But the hard part is getting through the public process, getting public approval ... for significant changes in how the public right of way is used, something that hasn't changed in 50 to 60 years."

MTA officials also unveiled the basic outline of their budget for the next two years and stressed that many of the improvements the agency wants to make will hinge on the passage of proposed bond and vehicle-license-fee ballot measures that Mayor Ed Lee wants on the November ballot.

"If we fail to pass the bond measure, there would be a significant impact on our transportation agency," said Sonali Bose, MTA finance director.

Those effects could include a decline in the condition of the agency's infrastructure, no funding to increase transit service and a shortage of money for pedestrian and bicycle improvements.

Pedestrian safety was a major focus of the meeting, which occurred shortly after a pedestrian fatality Tuesday morning in the Sunset District. While Tuesday's meeting was focused on discussion, the board took one action, approving a resolution supporting "Vision Zero," a strategy designed to make safety improvements, educate drivers and pedestrians and enforce traffic laws in an effort to eliminate pedestrian deaths.

Nicole Schneider, executive director of Walk San Francisco, was pleased by the action and encouraged by an MTA plan to improve pedestrian safety. But she said she hopes it brings concrete improvements, and quickly.

"We've had plans and plans and plans," she said. "Hopefully, we can now start to build. We need the city to make this a priority."